基本完成Lab5代码（目测存在bug）

src/views/coupon/AllCoupon.vue

@@ -1,7 +1,7 @@
 <!--Lab4新增，全部优惠券界面-->
 <script setup lang="ts">
 import {computed, ref} from "vue"
-import {createCoupons, getCouponGroups, getCoupons, receiveCouponGroup} from "../../api/coupon"
+import {createCoupon, getCouponGroups, getCoupons, receiveCouponGroup} from "../../api/coupon"
 import {userInfo} from "../../api/user"
 import {parseCouponType} from "../../utils"
 
@@ -74,7 +74,7 @@ function handleCreateCoupon() {
     rest: rest.value
   }
   couponDialogVisible.value = false
-  createCoupons(payload).then(res => {
+  createCoupon(payload).then(res => {
     if (res.data.code === '000') {
       ElMessage({
         message: '创建优惠券成功！',